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A 'blue green deployment' supports testing by
AKeeping two identical environments and switching
BSharing a single environment among versions
CUsing only one server during the rollout
DStopping all tests during the rollout
Answer & Solution
Correct answer: A. Keeping two identical environments and switching
Blue-green: blue runs current; green deploys the new version; smoke tests run on green; then load balancer switches from blue to green. Quick rollback by switching back. Distinct from canary (gradual percentage shift).
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